Carotenoids. Chemische Reihe : Birkhauser : 9783034858328 : 3034858329 : 04 Dec 2014 : 0. ISLER Chemical Research Department, F. Hoffmann-LaRoche&Co. Ltd. , Basle, Switzerland A. General Remarks . . . 12 B. Historical Development 13 C. Scope and Limitations 15 D. Vitamins A and Provitamins A . 15 E. Carotenoids as Natural Colouring Matters . 19 F. Other Natural Pigments and Related Compounds. 21 G. Nomenclature . . . 22 H. Lists of Carotenoids 24 I. Acknowledgments 25 References . . . . . . 25 0. ISLER 12 A. General Remarks The brightly coloured carotenoid pigments have aroused the curiosity of scientists since the beginning of organic chemistry. Indeed some of the oldest studies were published during the early 19th century. Research on carotenoids can be separated into four broad periods according to the selection of problems and the methods of attacking them. During the 19th century, the emphasis was on isolation of the pigments and their characterization by measurements of light abs